Disposable safety syringe which leaves no residual injection

ABSTRACT

The present invention relates to a one-time use disposable safety syringe, which will not leave any remnant of an injection behind and facilitate disposal of needles with safety after use, and more particularly to a disposable safety syringe, which consists of a barrel, a needle-setup tube to be connected by a connecting tip for a needle-setup tube at the upper end of said barrel, a syringe plunger to be inserted in said barrel to push the syringe, and a needle protective barrel, and which can, by means of making a packing protrusion formed on a injection packing at the upper end of said syringe plunger come into close contact with a residual-preventing outlet to prevent remaining of the injection solution, said hole being connected with the rear of said needle of said needle-setup tube, facilitate injection of the whole quantity of an injection, and which does, by allowing easily to separate the needle-setup tube with the needle securely inside from said barrel, make it possible to dispose of a used needle with safety, whereby it precludes reuse a needle, thus defending both medical personnel and disposers of used needles against infection via blood from AIDS, hepatitis, or other fatal diseases caused by pathogenic bacteria by inadvertently getting pricked by such used needles.

TECHNICAL FIELD

[0001] The present invention relates to a one-time use disposable safety syringe which is used, leaving no remainder of an injection behind, and which facilitates safety disposal of used syringes in safety, and more particularly relates to a disposable safety syringe which can, by making a packing protrusion formed at the upper end of a syringe plunger reach a hole prepared for flow, help leaving no remainder of the injection behind and assure that a used needle can be disposed of with safety by making it possible to separate a needle protective barrel with the used needle secured inside from the barrel of the syringe.

BACKGROUND ART

[0002] A conventional disposal syringe is so structured that the injection solution will flow into the needle connected with an outlet formed at the upper end of its barrel, when a syringe plunger inserted in the barrel is pressed by a finger, but, although the injection solution is made to flow by pressure until the syringe plunger reaches its ultimate point, a small amount of the solution (0.07 cc), which flows into the injection outlet of the barrel, remains unaffected by the pressure of the syringe plunger, the upshot being that enormous quantities of injection solution are thrown away unused, causing a tremendous economical loss, if the apparently negligible remainders in the syringes disposed of are all added up.

[0003] These conventional disposable syringes are each covered by a cap for protection of the needle, and at the time of use they are taken off, and after use the needles are separated from the barrels before disposal lest the needles should prick the persons who handle them later.

[0004] But if anyone is pricked by a needle by inadvertency after its use there will be risks of getting infected with such fatal diseases as AIDS, hepatitis, and so on. Not only that, used needles always being thrown away naked, there always remain such dangers for people engaged in disposal of garbage and the like, wherefore, work of collection or disposal of such garbage will itself prove loathsome.

[0005] Moreover, such conventional syringes do not have a catching chin to arrest retreat of the syringe plunger at a certain point when an injector pulls it back for suction of an injection from the vial, and so there is risk of getting all the injection lost if by inadvertency the syringe plunger is entirely pulled out, away from the barrel.

DISCLOSURE OF INVENTION

[0006] The present invention was conceived of to remedy all these defects inherent in the conventional disposable syringe, described above, by providing a disposable syringe, economical and safe for handlers, which assures of the use of the total content of a vial, leaving no remainder behind when use, prevents loss of the injection by inadvertence by means of a catching chin formed to arrest the retreat of the syringe plunger at a certain point, and protects people who handle the needles from fatal contagion by making it possible easily to put the needle in a container and separate from the barrel before disposal.

BRIEF DESCRIPTION OF DRAWINGS

[0007]FIG. 1 provides perspective views of a dissembled safety syringe according to the present invention and sectional perspective views of its parts.

[0008]FIG. 2 is a vertical sectional view of the safety syringe of the present invention.

[0009]FIG. 3 is a vertical sectional view of the safety syringe of the present invention to show its structure when it is not yet filled with injection solution.

[0010]FIG. 4 is a vertical sectional view of the safety syringe of the present invention to show its structure after the needle protective barrel (safety device) has been put into action.

[0011]FIG. 5 is a vertical sectional view of the needle protective barrel (safety device) to show how it looks when it is separated from the barrel.

BEST MODE FOR CARRYING OUT THE INVENTION

[0012] To attain such aims as are described above the safety syringe of the present invention is manufactured in a manner that, by forming a packing protrusion at the upper end of a syringe plunger to be inserted in the outer barrel of a syringe, it is allowed to enter the hole in the rear of a needle up to the final point of approach; while a needle protective barrel to be inserted from the outside of the barrel is structured to be separable together with a needle-setup tube from the barrel, but inside the lower end of said needle protective barrel are formed a protrusion for stopping regression of a needle hub to arrest further retreat of a needle hub containing the needle and a protrusion 24 for catching onto a needle hub; and an protrusion for preventing loss of injection is formed below a injection packing; and the protrusion for preventing loss of injection is made unable to retreat further when it is caught in an injection-loss stopping chin formed inside the lower end of said barrel.

[0013] Below, the disposable safety syringe of the present invention is described in further detail, references being made to the attached drawings.

[0014]FIG. 1 includes disassembled, perspective sectional views of the disposable safety syringe of the present invention, while FIG. 2 is a vertical sectional view of it.

[0015] As shown in the drawings, the safety syringe comprises: a barrel having a connecting tip 26 for a needle-setup tube in the upper end, an injection outlet 12 formed through the center, a rear cap connector 15 to keep sterility screwed with a barrel finger flange 14 and a rear cap 7 for maintenance of sterility formed in turn in the lower end; a needle-setup tube 5 which, having a needle 8 inserted in the upper end, a residual-preventing outlet 9 connected with the rear part of said needle 8, and a needle hub 10 formed in the lower end, is to be connected with said connecting tip 26 for a needle-setup tube; a protective cap 6 for a syringe needle, to be put on said needle-setup tube 5; a syringe plunger 2 which, having a injection packing 3 in the upper end and a syringe thumb rest 18 in the lower end, is to be inserted in said barrel 1; and a needle protective barrel 4 which, having a disposal cap connector 19 to be connected with a disposal cap 25 and a detachment handle 21, all formed in turn in the upper end, and a thread 20 for connection with said needle hub, is to be put on the outside of said barrel 1.

[0016] In the lower end of said barrel 1 an protrusion 13 for cutting off loss of injection is formed slanting upward, while a number of sterility maintenance rings 11 are formed around the inside of the lower end of said protective cap 6 for a syringe needle and a rear cap 7, a packing protrusion 16 is formed above said injection packing 3 connected with the upper end of said syringe plunger 2, and an protrusion 17 for preventing loss of injection is formed around the lower end of said injection packing 3.

[0017] Around the lower end of said needle protective barrel 4 a needle hub catching chin 24 is formed, and on the inside of said a protrusion 24 for catching onto a needle hub four a protrusion 22 for stopping regression of a needle hub are formed one at a certain interval slanting downward which said needle-setup tube 5 can pass over, while a needle hub catching space 23 is formed this way between said a protrusion 24 for catching onto a needle hub and said a protrusion 22 for stopping regression of a needle hub.

[0018] Moreover, the packing protrusion 16 formed in said injection packing 3 of said syringe plunger 2 is made to come into contact with said residual-preventing outlet 9 connected to the rear of the needle 8 in said needle-setup tube 5 via the inside of the needle-tube connection tip 12.

[0019] Next, now, the functions of the disposal safety syringe of the present invention, as structured above, are given.

[0020]FIG. 3 shows the structural sectional view of the syringe in the state prior to the intake of an injection. As shown in the drawing, when using the syringe sterilized by the sterility-maintenance rings 11 formed in the protective cap 6 for a syringe needle, both the protective cap 6 for a syringe needle and the rear cap 7 connected with the rear end of the needle are removed, and then the needle 8 is stuck in the vial (not in the drawing) and the syringe plunger 2 is pulled backward to intake the injection.

[0021] At this time, even if the syringe plunger 2 is pulled back to its end it stops at the proper position because the protrusion 17 for preventing loss of injection of the syringe plunger 2 is caught at the protrusion 13 for cutting off loss of injection of the barrel 1 and its further retreat is not allowed, said syringe plunger 2 being never to be pulled entirely out of the barrel 1. The protrusion 13 for cutting off loss of injection slants inward toward the inside of said barrel 1 and so said syringe plunger 2 can pass over said protrusion 13 for cutting off loss of injection to be inserted in said barrel 1.

[0022]FIG. 4 is a structural sectional view of the disposal safety syringe of the present invention in the state after the intake of an injection. As shown in the drawing, the needle protective barrel 4 is moved to the upper end of said barrel 1 so that the needle hub 10 is caught in said a protrusion 24 for catching onto a needle hub, but if it is so made that the thread 20 revolves on the needle hub 10 and comes apart by tuning the needle protective barrel 4 in a direction, then the needle hub 10 of the needle-setup tube S passes over the a protrusion 22 for stopping regression of a needle hub which slants toward the lower end of said needle protective barrel 4 and settles within said needle hub catching space 23, whereby the needle-setup tube 5 and the needle 8 are contained securely in the needle protective barrel 4, unable to move up or down.

[0023]FIG. 5 is a perspective view of the needle protective barrel separated from the syringe. As shown in the drawing, when force is applied further on said needle protective barrel 4 toward the upper side of said barrel 1, the needle hub 10 of the needle-setup tube 5 gets caught in the a protrusion 24 for catching onto a needle hub and this way both the needle protective barrel 4 and the needle-setup tube 5 are separated from said barrel 1. At this time, the needle hub 4 is made unable to come off the needle hub catching space 23 between the a-protrusion 22 for stopping regression of a needle hub and the a protrusion 24 for catching onto a needle hub, whereupon the needle 8 and said needle-setup tube 5 securely remain inside said needle protective barrel 4, precluding the reuse of the needle.

[0024] This way, when the needle protective barrel 4 is entirely separated from the barrel 1, the disposal cap 25 is put on the disposal cap connector 19 in the upper end of said needle protective barrel 4, and then the needle protective barrel 4 is disposed of.

[0025] The above-described syringe is sterilized by lowering the temperature inside a sterilizing chamber (not in the drawings), and the sterility time in the ordinary atmosphere can be prolonged by the protective cap 6 for a syringe needle and the sterility-maintenance rings 11 formed in the rear cap 7.

[0026] According to the safety syringe of the present invention, it is possible to use the total intake of an injection and leave no remnant behind, to be free of risks of the syringe plunger coming off of the barrel causing loss of the injection, and to be assured of safety from secondary infection from fatal diseases by inadvertent handling of the used needles. 

What is claimed is:
 1. A disposable safety syringe, which leaves no residual injection, comprising: (a) a syringe barrel, which comprises a connecting tip for a needle-setup tube, at the upper end thereof; an injection outlet passing through the center thereof; a barrel finger flange and then a rear-cap connector for maintaining sterility, at the lower end thereof; and a protrusion for cutting off loss of injection, which is slanted toward the upper end, around the inner girth of the lower end thereof; (b) a needle-setup tube, to be connected to the connecting tip for a needle-setup tube of said syringe barrel, wherein said needle-setup tube comprises a syringe needle connected to the upper end thereof; a residual-preventing outlet connected to the rear side of said syringe needle and a needle hub at the lower end thereof, (c) a syringe plunger, which comprises an injection packing connected at the upper end thereof; a syringe thumb rest at the lower end thereof, to be inserted into the syringe barrel; a packing protrusion at the upper part of said injection packing, which is in contact with the surface of the residual-preventing outlet of the needle-setup tube; and a protrusion for preventing loss of injection formed around the girth of the lower end of said injection packing; and (d) a needle protective barrel, placed outside of the syringe barrel, which comprises a disposable-cap connector, and then a detachment handle at the upper end thereof.
 2. The disposable safety syringe, which leaves no residual injection, according to claim 1, which comprises a rear cap for maintaining sterility, connected to the rear-cap connector for maintaining sterility of said syringe barrel.
 3. The disposable safety syringe, which leaves no residual injection, according to claim 1, which comprises a disposable cap, connected to the disposable-cap connector of said needle protective barrel.
 4. The disposable safety syringe, which leaves no residual injection, according to claim 1, which comprises a protective cap for a syringe needle connected to said needle-setup tube.
 5. The disposable safety syringe, which leaves no residual injection, according to claim 2 or 4, which comprises a multiple of sterility-maintenance rings, formed vertically side by side, around the girth of inner side of the lower end of said protective cap 6 for a syringe needle, and said rear cap for maintaining sterility, respectively.
 6. The disposable safety syringe, which leaves no residual injection, according to claim 1, wherein said needle protective barrel comprises a connecting thread for a needle hub around the inner surface at the upper end thereof; a protrusion for catching onto a needle hub formed around the girth of the lower end thereof; and a protrusion for stopping regression of a needle hub, slanting downward, at the inner side of said protrusion for catching onto a needle hub. 